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一、74年洪水水情及其变迁沂沭泗流域曾于57、63、74年发生过三次较大洪水,以洪水总量(三十天)分析,当以57年洪水为最大,相当于五十年一遇,但从中下游出现的洪水形态之险恶来讲,则以74年为最。实际上,74年洪水频率仅相当于十年一遇,但中下游各地的峰量和水量均超过或接近57年骆马湖最大三天进湖总量21.7亿立米,为57年的1.9倍。而下泄各闸中新沂河嶂山闸最
First, the 74 years of flooding and its changes Yishu Si basin once 57, 63, 74 occurred in three major floods, with floods total (thirty days) analysis, when the 57-year floods for the largest, equivalent to In 50 years, it takes 74 years to be the worst when it comes to the sinister flood patterns in the middle and lower reaches. In fact, the frequency of 74 years of floods is only equivalent to 10 years, but the peak and the amount of water in the middle and lower reaches are all over or near 57 years. The maximum three days into Luoma Lake is 2.17 billion cubic meters, 1.9 times of 57 years . The release of the gates of the Xinyi River Yanshan most gates